Re: [exim] conducive.org

Renaud Allard wrote:

>
> David Woodhouse wrote:
>
>>On Wed, 2006-10-18 at 18:43 +0800, W B Hacker wrote:
>>
>>>As we have no such user as:
>>>gandalf.llorien.org-1159383911-testing@???
>>>This was neither....
>>
>>That's done in order to reduce the load on the server we call out to.
>>
>>While we happen to be connected after a successful callout, we try a
>>second RCPT with an address which is fairly sure to fail. If _that_ is
>>accepted, we assume that the server in question will accept _all_
>>callouts, so we don't bother to make any more (at least until the cache
>>expires).
>>
>
>
> That's indeed the purpose of the random callout: reduce load on some
> remote servers.
> Furthermore, if you blacklist an IP just because it sends _ONE_ mail to
> a non existing user, you will rapidly end up blacklisting many people
> who should not have been. And if your error message states this is
> because the sender is not RFC compliant, while it in fact is, it is even
> worse.

That probe was, in fact, NOT RFC compliant, and whether someone who has a server
so configured 'should not have been' blacklisted doesn't seem to be at issue.

Bill